Catalytic combustion of methane over Pd containing perovskite type oxides
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2005
Authors
Petrović, Srđan
Karanović, Ljiljana

Stefanov, Plamen K.
Zdujić, Miodrag

Terlecki Baričević, Ana
Article (Published version)

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The mixed perovskite type oxides with nominal formula LaTi0.5Mg0.5-xPdxO3, (0 LT = x LT = 0.10) were prepared by anneling the ethanol solution of precursor in nitrogen flow at 1200 degrees C. X-ray powder diffraction (XRPD) analysis shows that the orthorhombic perovskite structure was found in all investigated samples. However, at least a part of palladium is not incorporated into perovskite structure and remains as separate phase, which is reduced to Pd-0 at 1200 degrees C. X-ray photoelectron spectroscopy (XPS) reveled the presence of Pd2+, which indicate a reoxidation of Pd-0 in the surface layers during cooling. The Pd content in the samples has a small influence on the methane oxidation activity below the temperature of 500 degrees C. At temperatures higher than 500 C, the methane oxidation activity of the sample with x = 0.05 exceeds the activity of the sample with x = 0.10. The sharp increase of methane oxidation activity over the sample with lower content of palladium at abou...t 500 degrees C was ascribed to the higher dispersion of PdO and Pd-0 phases. Thus, the higher contribution of lattice oxygen and possible local change in oxidation state of palladium can be a reason for the enhanced activity. Contrary to the supported Pd/Al2O3 catalyst, the incorporation of palladium into perovskite matrix and interaction of PdO-Pd-0 benefits the activity of smaller particles at higher reaction temperatures.
Keywords:
XPS / perovskite / catalytic combustionSource:
Applied Catalysis B: Environmental, 2005, 58, 1-2, 133-141Publisher:
- Elsevier Science Bv, Amsterdam
DOI: 10.1016/j.apcatb.2004.11.020
ISSN: 0926-3373
WoS: 000229514800016
Scopus: 2-s2.0-18544382870
Institution/Community
Институт техничких наука САНУ / Institute of Technical Sciences of SASATY - JOUR AU - Petrović, Srđan AU - Karanović, Ljiljana AU - Stefanov, Plamen K. AU - Zdujić, Miodrag AU - Terlecki Baričević, Ana PY - 2005 UR - https://dais.sanu.ac.rs/123456789/4838 AB - The mixed perovskite type oxides with nominal formula LaTi0.5Mg0.5-xPdxO3, (0 LT = x LT = 0.10) were prepared by anneling the ethanol solution of precursor in nitrogen flow at 1200 degrees C. X-ray powder diffraction (XRPD) analysis shows that the orthorhombic perovskite structure was found in all investigated samples. However, at least a part of palladium is not incorporated into perovskite structure and remains as separate phase, which is reduced to Pd-0 at 1200 degrees C. X-ray photoelectron spectroscopy (XPS) reveled the presence of Pd2+, which indicate a reoxidation of Pd-0 in the surface layers during cooling. The Pd content in the samples has a small influence on the methane oxidation activity below the temperature of 500 degrees C. At temperatures higher than 500 C, the methane oxidation activity of the sample with x = 0.05 exceeds the activity of the sample with x = 0.10. The sharp increase of methane oxidation activity over the sample with lower content of palladium at about 500 degrees C was ascribed to the higher dispersion of PdO and Pd-0 phases. Thus, the higher contribution of lattice oxygen and possible local change in oxidation state of palladium can be a reason for the enhanced activity. Contrary to the supported Pd/Al2O3 catalyst, the incorporation of palladium into perovskite matrix and interaction of PdO-Pd-0 benefits the activity of smaller particles at higher reaction temperatures. PB - Elsevier Science Bv, Amsterdam T2 - Applied Catalysis B: Environmental T1 - Catalytic combustion of methane over Pd containing perovskite type oxides SP - 133 EP - 141 VL - 58 IS - 1-2 DO - 10.1016/j.apcatb.2004.11.020 UR - https://hdl.handle.net/21.15107/rcub_dais_4838 ER -
@article{ author = "Petrović, Srđan and Karanović, Ljiljana and Stefanov, Plamen K. and Zdujić, Miodrag and Terlecki Baričević, Ana", year = "2005", abstract = "The mixed perovskite type oxides with nominal formula LaTi0.5Mg0.5-xPdxO3, (0 LT = x LT = 0.10) were prepared by anneling the ethanol solution of precursor in nitrogen flow at 1200 degrees C. X-ray powder diffraction (XRPD) analysis shows that the orthorhombic perovskite structure was found in all investigated samples. However, at least a part of palladium is not incorporated into perovskite structure and remains as separate phase, which is reduced to Pd-0 at 1200 degrees C. X-ray photoelectron spectroscopy (XPS) reveled the presence of Pd2+, which indicate a reoxidation of Pd-0 in the surface layers during cooling. The Pd content in the samples has a small influence on the methane oxidation activity below the temperature of 500 degrees C. At temperatures higher than 500 C, the methane oxidation activity of the sample with x = 0.05 exceeds the activity of the sample with x = 0.10. The sharp increase of methane oxidation activity over the sample with lower content of palladium at about 500 degrees C was ascribed to the higher dispersion of PdO and Pd-0 phases. Thus, the higher contribution of lattice oxygen and possible local change in oxidation state of palladium can be a reason for the enhanced activity. Contrary to the supported Pd/Al2O3 catalyst, the incorporation of palladium into perovskite matrix and interaction of PdO-Pd-0 benefits the activity of smaller particles at higher reaction temperatures.", publisher = "Elsevier Science Bv, Amsterdam", journal = "Applied Catalysis B: Environmental", title = "Catalytic combustion of methane over Pd containing perovskite type oxides", pages = "133-141", volume = "58", number = "1-2", doi = "10.1016/j.apcatb.2004.11.020", url = "https://hdl.handle.net/21.15107/rcub_dais_4838" }
Petrović, S., Karanović, L., Stefanov, P. K., Zdujić, M.,& Terlecki Baričević, A.. (2005). Catalytic combustion of methane over Pd containing perovskite type oxides. in Applied Catalysis B: Environmental Elsevier Science Bv, Amsterdam., 58(1-2), 133-141. https://doi.org/10.1016/j.apcatb.2004.11.020 https://hdl.handle.net/21.15107/rcub_dais_4838
Petrović S, Karanović L, Stefanov PK, Zdujić M, Terlecki Baričević A. Catalytic combustion of methane over Pd containing perovskite type oxides. in Applied Catalysis B: Environmental. 2005;58(1-2):133-141. doi:10.1016/j.apcatb.2004.11.020 https://hdl.handle.net/21.15107/rcub_dais_4838 .
Petrović, Srđan, Karanović, Ljiljana, Stefanov, Plamen K., Zdujić, Miodrag, Terlecki Baričević, Ana, "Catalytic combustion of methane over Pd containing perovskite type oxides" in Applied Catalysis B: Environmental, 58, no. 1-2 (2005):133-141, https://doi.org/10.1016/j.apcatb.2004.11.020 ., https://hdl.handle.net/21.15107/rcub_dais_4838 .